1994 JAGUAR XJ6 Electrical Diagnostic Manual

w Automatic Transmission (AJ16)
TRANSMISSION RANGE SENSOR - P 0705 / P 0706
The rotary switch is located on the LH side of the transmission. The harness incorporates the transmission wiring and
runs into the car through the a hole in the LH side of the tunnel. The connectors GBOOI and GB002 are located on the
side of the selector mechanism ‘J’ gate assembly.
TRANSMISSION RANGE SENSOR CIRCUIT - P 0705
This test is performed continuously by the background diagnostics during operation. The test is a plausibility check
on the 3 bit Gray code. The test criteria is that an invalid code must not be seen. If a Z code is seen for more than looms,
then this fault code will be stored and the transmission will adopt the default function.
TRANSMISSION RANGE SENSOR CIRCUIT RANGE/ PERFORMANCE - P 0706
This is a plausibilitycheck on the 3 bit Gray code which is only performed once during cranking when the engine speed
reaches
a specific threshold. If the gear is not P or N when this test is performed, then this fault code will be flagged
and the transmission will adopt the default function.
ROTARY SWITCH
(GB002)
PIN 1 -SWITCH COMMON
PIN
2 -CODE X OUTPUT
PIN
3 -CODE Y OUTPUT
PIN
4 -CODE Z OUTPUT
Possible causes
Open circuit on X, Y or Z line from rotary switch.
9 Faulty operation of rotary switch.
Effects:
. MIL illuminated.
. Transmission warning lamp illuminated.
. Maximum fluid pressure applied.
. Limp home mode applied.
Remedy:
. Repair or renew harness I connectors.
. Check selector cable and adjust or renew if necessary.
. Check rotary switch and adjust or renew if necessary.
X300 EDM Issue 1 August 1994 6

Automatic Transmission (AJl6)
t12v
X
Y
z
4 1
J88 - 1731
Fig. 1 - Fault Codes PO705 I PO706
X300 EDM 7 Issue 1 August 1994

IW Automatic Transmission (AJ16)
TRANSMISSION FLUID TEMPERATURE SENSOR INPUTS P 0712 / P 0713
The transmission fluid temperature sensor is a positive temperature coefficient thermistor bead, located in the internal
wiring harness of the transmission assembly and immersed in the transmission fluid in the unit sump. The wiring is
taken out through the transmission connector and runs through the rotary switch and then into the gearbox harness
to the TCM. The pin outs on the relevant parts are as follows.
TCM ROTARY SWITCH TRANSMISSION
55 WAY CONNECTOR 12 WAY MULTI-LOCK 9 PIN DEUTSCH
(CC007) (GB002) (GB003)
PIN 46 - SIGNAL PIN 8 -SIGNAL PIN D -SIGNAL
PIN
44 -GROUND PIN 9 - GROUND PIN J -GROUND
TRANSMISSION FLUID TEMPERATURE SENSOR LOW INPUT- P 0712
This input is continuously monitored during initialization and operation by the processor and is checked against spe- cific limits to be in range. If the temperature indicated by the sensor is too low then this fault code will be stored and
the processor will use a substitute value for the transmission oil temperature.
The low limit is approximately
-50" C. This fault would indicate that the output signal line (Pin 46) is probably short
circuit to ground.
TRANSMISSION FLUID TEMPERATURE SENSOR HIGH INPUT- P 0713
This input is continuously monitored during initialization and operation by the processor and is checked against spe- cific limits to be in range. If the temperature indicated by the sensor is too high then this fault code will be stored and
the processor will use a substitute value for the transmission oil temperature. The high limit is approximately 185" C.
This fault would indicate that the input signal line (Pin 46) is probably open circuit or short circuit to battery positive
voltage (+I2 nominal).
Possible causes:
. Faulty sensor.
. Faulty harness wiring or connection to sensor.
Effects:
. Substitute oil temperature adopted by TCM.
Remedy:
Renew internal harness.
. Repair or renew harness I connectors.
Issue 1 August 1994 8 X300 EDM

r
P No
1 r
V
ww T
4 - lOnF
)P46 YQ PO(,
PJ (I )P44 Bc
Fig. 1 Fault Codes PO712 / PO713
2
X300 EDM 9 Issue 1 August 1994

Automatic Transmission (AJ16)
OUTPUT SPEED SENSOR - P 0721 / P 0722
The output speed sensor is located on the rear of thevalve block assembly inside the transmission. Connection is made
via pins A and F of the %way transmission connector located on the left hand side of the transmission assembly. The
wiring runs through the rotary switch harness and the vehicle gearbox harness to the TCM on pins 2 and 38 of the 55 way multi-plug. These wires are shielded by a screen which is terminated on pin 20 of the TCM multi-plug. The sensor
detects the motion of the output shaft via a 36 toothed wheel.
TCM ROTARY SWITCH TRANSMISSION
(CC007) (GB002) (GB003)
PIN 2 -SIGNAL PIN 11 -SIGNAL PIN F -SIGNAL
PIN 38
- GROUND PIN 12 -GROUND PIN
A - GROUND
OUTPUT SPEED SENSOR CIRCUIT RANGE/ PERFORMANCE - P 0721
This test is only performed when a downshift takes place and therefore the vehicle must be in a forward gear ie D, 3, 2, 1. A fault will be flagged if the engine speed is above a threshold which is dependant on the shift and the state of the lock up clutch.
This fault code would suggest that there is an intermittent fault in the circuit.
OUTPUT SPEED SENSOR CIRCUIT NO SIGNAL - P 0722
The background diagnostic software continuously monitors the output speed and flags this fault if the output speed
is zero when the engine speed is greater than 2000 rpm and a forward gear, D, 3,2,1, is selected.
This fault code would suggest
a permanent fault, either open circuit, short to ground or short circuit to battery positive
voltage (+12V nominal).
Possible causes:
Faulty sensor.
Faulty harness wiring I connectors.
Effects:
MIL illuminated.
Transmission warning lamp illuminated.
Maximum pressure applied.
Limp home mode applied.
Remedy:
Renew sensor.
Repair or renew harness I connectors. ~~~~ ~~
Issue 1 August 1994 10 X300 EDM

1 2
JW-1733
Fig. 1 Fault Codes PO721 / PO722
X300 EDM 11 Issue 1 August 1994

w Automatic Transmission (AJ16)
ENGINE SPEED INPUT - P 0726 / P 0727
The engine speed input signal is a square wave output from the ECM. The signal is 12 volt active high with a duty cycle
of 50" / 120" of crankshaft revolution ie 3 pulses per revolution. The frequency of the signal is proportional to engine
speed.
TCM
PI HARNESS ECM
CC007/003 P1063/002 Pl104/022
ENGINE SPEED INPUT CIRCUIT - RANGE / PERFORMANCE P 0726
Engine speed is continuously monitored by the background diagnostics. This fault is flagged if the engine speed ex-
ceeds the maximum speed threshold (approx 6800 rpm). This fault code would suggest an intermittent fault in the cir- cuit.
ENGINE SPEED INPUT CIRCUIT NO SIGNAL - P 0727
If the engine speed drops below 95 rpm and the selected gear is not P or N, then the TCM will initiate the default mode.
This fault code will only be stored if the output speed is greater than 300 rpm. This is to prevent spurious flagging of
codes if the engine stalls.
Possible causes:
. Faulty harness wiring 1 connectors.
. Faulty signal from ECM.
Effects:
. MIL illuminated.
. Transmission warning lamp illuminated.
. Maximum fluid pressure applied.
. Limp home mode applied.
Remedy:
. Repair or renew harness /connectors.
. Examine ECM fault diagnosis (refer to EC Section 1).
Issue 1 August 1994 12 X300 EDM

Automatic Transmission (AJ16)
il
6
P
1
Fig. 1 Fault Codes PO726 1 PO727
X300 EDM 13 Issue 1 August 1994